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vfsstat_example.txt
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/
vfsstat_example.txt
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Demonstrations of vfsstat, the Linux eBPF/bcc version.
This traces some common VFS calls and prints per-second summaries. By default,
the output interval is one second:
# ./vfsstat
TIME READ/s WRITE/s CREATE/s OPEN/s FSYNC/s
18:35:32: 231 12 4 98 0
18:35:33: 274 13 4 106 0
18:35:34: 586 86 4 251 0
18:35:35: 241 15 4 99 0
18:35:36: 232 10 4 98 0
18:35:37: 244 10 4 107 0
18:35:38: 235 13 4 97 0
18:35:39: 6749 2633 4 1446 0
18:35:40: 277 31 4 115 0
18:35:41: 238 16 6 102 0
18:35:42: 284 50 8 114 0
^C
Here we are using an output interval of five seconds, and printing three output
lines:
# ./vfsstat 5 3
TIME READ/s WRITE/s CREATE/s OPEN/s FSYNC/s
18:35:55: 238 8 3 101 0
18:36:00: 962 233 4 247 0
18:36:05: 241 8 3 100 0
Full usage:
# ./vfsstat -h
usage: vfsstat [-h] [-p PID] [interval] [count]
Count some VFS calls.
positional arguments:
interval output interval, in seconds
count number of outputs
optional arguments:
-h, --help show this help message and exit
-p PID, --pid PID trace this PID only
examples:
./vfsstat # count some VFS calls per second
./vfsstat -p 185 # trace PID 185 only
./vfsstat 2 5 # print 2 second summaries, 5 times